I know there are some oddball ones out there like 11, 14 and 18 but for the most part you only really find 10, 12, 16, 20, 28 and .410 (which of course is a caliber). When you look at pistol or rifle calibers there are 10+ times as many; then you have the fact 50% of the shotgun market (per Wikipedia) is just the 12 gauge. I understand the cost of introducing a new gauge/caliber but Glock did it with the .45 Gap in 2003 (granted with mixed results), Sig Sauer did it with the .357 SIG in 1994, S&W did it with the .40 in 1990 and .500 S&W in 2003. Is there anyone anywhere seriously trying to bring out a different beast? I know someone will say-what does a say proposed 23 gauge offer a 12 or 20 doesn't today? See my previous comment about pistol calibers...hasn't stopped manufacturers yet Wanna kill these ads? We can help!